Oh, this mabo doofu is authentic.

The spiciness is spreading across my palate.

Japanese restaurants adapts the flavor to people's tastes, so they tone down the spiciness.

spiciness   /'spaɪsinəs/　n)辛さ

palate　/'pælət/　n)口蓋(こうがい:口の中の味覚を感じる部分)・味の識別力

people's tastes　人々の好み

tone down　/təƱn/　和らげる・抑える